| Mariana Pimentel | |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -30.3333°N -86°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Type1: | State |
| Subdivision Name1: | Rio Grande do Sul |
| Subdivision Type2: | Mesoregion |
| Subdivision Type3: | Microregion |
| Leader Title: | Mayor |
| Established Title: | Founded |
| Total Type: | Total |
| Population As Of: | 2020[1] |
| Population Total: | 3,888 |
| Population Density Km2: | auto |
| Timezone: | BRT |
| Utc Offset: | -3 |
Mariana Pimentel is a municipality in the state of Rio Grande do Sul, Brazil. It is located approximately 75 km from the state's capital, Porto Alegre.
Mariana Pimentel belongs to Porto Alegre Metropolitan Mesoregion and to Porto Alegre Microregion.The municipality can be accessed through RS-711, which is connected to BR-116.
The outcrop Morro do Papaléo within Mariana Pimentel was the discovery site of two species of the extinct algae Brazilea, dating back to the Sakmarian of the Permian.[2]